I have an iPhone 3GS on the UK O2 network. O2 have recently unlocked the unit for me and sent an SMS confirming. I have place my French Orange sim in the unit and I get "Invalid Sim" What do I need to do to get the unit to work with this sim card ?
Sorted out: O2 now are unlocking contracted iPhones free of charge. Call 202 from your O2 iPhone and ask them to do it. They will send an SMS a few days later confirming unlocked. Then you need to: Back up via iTunes (Right Click on the unit on iTunes) Restore via iTunes (Main iTunes window - Not with the back up) Restore Back Up via iTunes (Right Click on the unit on iTunes) Test with an alternative sim card. Bingo !